Computing machine



Nov. 27, 1934.

F A. HART COMPUTING MACHINE Original Filed Jan; 21, 1927 ATTORNEY Patented Nov. 27, 1934 UNITED STATES COMPUTING MACHINE Frederick A. Hart, Stamford, Conn, assignor to Remington Typewriter Company, Ilion, N. Y., a

corporation of New York I Original application January 21, 1927., Serial No.

Divided and this application October.

1. 1931, Serial No. 566,188

3 Claims. (01. 287452;

My invention relates to computing machines.

In these machines there are parts of themechanism that are reguiredto-move with aconsiderable degree of precision and at the same time, I especially in computing machines of that class in which the. computing mechanism is operated-by the keys of a typewriter, it is necessary that the parts move freely so as to offer as little resistance as possible to the operation of the key. "The pres- 1o ent invention has for-its principal ,objectto, im-

prove mechanism of this character. in respect to precision of movement and readiness, accuracy and permanency of adjustment, together with freedom of movement; and to attain these objects II with mechanism that may be easily and cheaply manufactured, l

To the above and other ends my invention consists in certain features of construction and combinations and arrangements of parts, all of which 86 will be fully described herein and particularly pointed out in the claims,

This application isa division of my, prior application Serial 'No. 162,473,, filed Jan. 21,1927.

I have shown my invention applied to a Remington combined typewriting and computing machine, the general construction and mode of operation of which are well-known to the art. For the purposes of the present invention the machine may, if desired, be made as described in thepatent 80 to Wahl No. 1,270,471, dated June 25, 1918, ex-

cept as hereinafter pointed out. In other words, for the purpose of description the invention in the form in which it is set forth herein may be regarded as an improvement in the mechanical structure of the machine described in said patent.

In view of what has just been said;. the accompanying drawings show only so much'of the machine as is necessary to illustrate my improvements. V k a In said drawings, all of which are more or less fragmentary,

Figure 1 is a front View of the right-hand end portion of the computing mechanism;

Figure 2 a right-hand view in section on the line 2-2 of'Figure 1;

Figure 3 is an irregular section approximately on the line 3-3 of Figure 1 and-looking downward.

Figures 4, 5 and 6 are details in perspective.

, Figures 3-6 are on land 2. V l a The Remington combined typewriting and computing machine comprises a Remington typewriter having attached thereto computing mechanism of the sort described in the Wahl patent above referred to,; The actuator of said coma larger scale than Figures puting mechanism comprises a main frame casting 10 secured to the top plate of the typewriter and a number of sheet metal frame plates, pro- ;J'ecting in front and rear planes from said casting. Four of said plates areshown in the drawings and designated 14, 15, 16, and 17. Plate 14 may be regardedas the right-hand end plate of the vertical actuatorand it is secured to the main casting 10 y two screws 26L Plate 15 is the'left-hand end plate of the cross actuator, the rightehand end plate of which is not shown, but in the machine it is supported on'the extreme right-hand end of the casting 10. The frame plates 15, .16and 17 are supported directly or indirectly from plate 14 and the [right-hand end plate, not shown, the supports consisting of certain cross rods or posts, some of which are shown and numbered 21, 22, 23 and'24. Each of the parts marked 21, 22, and 23 consists of a rod running through all of the plates and having sleeves or bushings strung on it to space the'plates apart. a

Each of the ten numeral keys of the typewriter has connected thereto a link which at its upper end is pivoted to a soca11ed"fan", the hub of which is journaled on a cross rodlof the. vertical Q0. actuator. This so-called fan has, a part adapted to operate a universal bar which is supportedby suitable arms on a universal rockshaft 35, Fig.

2. Each fan operates a corresponding goose-neck cam which actuates an arm 43 secured to and 5 projecting from a differential rock shaft 44, which is journaled in the frame plates. This differential rock shaft 44 carries the usual peculiar hub struc-- ture to which is pivoted the usual gear sector or segment which operates the vertical master wheel.

Journaled in the frame plates 15 and16 is the differential shaft 54 of the cross footer on which the gear sector or segment 55 is mounted. The

sector 551s adapted to mesh for addition with the drive pinion 56 and for. subtraction with another drive pinion not shown, the pinion 56 being splined on the shaft 5'71 of the cross master wheel 58; saidshaft journaled in the frame plates 15 and 17, allas heretofore. "I'he two differential shafts are driven in unison by a linkage situated between the plates 14 and 1 5.and. comprising an arm 60 fast on the right-hand end of shaft 44, an arm 61 fast on the left-hand end of shaft 54 and a 05 connecting link 62. r l r The cross actuator alsocomprises a universal rock shaft 63 which is caused to move in unison with the shaft 35 by means of another linkage also situated between plates 14 and 15 and com-- 54 with ease and precision, and I have according- 1y provided ball bearings and certain adjustments which will now be described in the linkage by which these two shafts are connected.

The link 62 is at the right-hand side'of the arm 61 and it has a ball bearing groove turned in the body of the link itself and facing toward the right to accommodate balls 122. The cone 123 consists of ,a properly shaped head and bearing part and a stem screw threaded through the arm 61 so as to be adjustable, the adjustment being secured by a set screw at 124 as shown in Figs. 1 and 4, said set screw threaded through the arm 61 and bearing at its end against the screw-threads of part 123. The part of said screw just to the left of the head of the screw is properly turned to constitute a bearing to cooperate with the bearing groove in the link 62. Said linkis held properly pressed toward the right to cause the desired engagement with 'the balls 122 by means of another set of balls 125 which run against the. flat left-hand face of the link 62. These balls run in a suitable groove inla ring 126, said groove facing toward the right as shown in Fig. 3. Theleft-hand face of the ring bears against the fiat right-hand face of the arm"61. The pull lengthwise of thelink 62 is taken entirely by the balls 122, the balls 125 having for their sole function tohold the members of the bearing 62, 122, 123 in proper contact This form ofbearing isof such a sort that it can be adjusted to work smoothly and without lost motion without the necessity of the link 62 being made with great precision in a plane perpendicular to the axis of the cone 123. If the link were not exactly so perpendicular it might happen that only a few ofthe balls 125 would touch thelink 62 at one time but there would always be enough to hold the balls 122 in proper engagement so as not to allow lost motion in the bearing longitudinally of the link.

The bearing at the upper end of the link 62 is in all respects like that just described at the lower end. It includes a cone 127 like the cone 123, a ring 128 like the ring 126 and a set screw 130 like the set screw 124. Forconvenience of manufacture it is advantageous to have the parts of these two bearings interchangeable; The arm 60 is shown made with a split hub construced to fit snugly on the endof the shaft 44 where it can be readily adjusted and clamped with great security in adjusted position by means of a clamp screw 131. For the convenience of the assemblers of the'machine a shallow "slot 132 is cut across (the end of the shaft 44 like a screwdriver slot and this slot'bears such a relation to the other parts including the segment 47 that in assembling the machine the arm 60 may be so set on the shaft as that the split in said arm registers with this slot 44, thus bringing the arm 60 at the correct angle to the segment 4'']. In

order that the v motion be transmitted accurately it is not essential that this angle be established of adjustment, the segment 55 may then be set to its normal position whereupon the screw 133 may be tightened, thus bringing all of the parts into their proper relative normal positions and relations. 2

Having thus set the two shafts 44 and 54 in their correct normal relations, it may still be that, in operationthey do not swing through exactly the same angles. If now the shaft 44 and segment 47 be swung to the position to which the 9 key would move then, it. might be found that the segment 55 had been swung a little short of or a little beyond its 9 position. This would be remedied by adjusting the relative lengths of the arms 60 and. 61 and I have provided means for doing this, said means in the present instance being applied to the lower arm fil which can be slightlylengthened in case the sector 55 is found to swing through too'great an angle and slightly shortened if said sector is found to swing through too small an angle. To this end the arm 61 does not directlyengage'the shaft 54 but is mounted on it through the intennediary of a sleeve 134, as shown in Figs. 2 and 6. This sleeve is split throughout its length as shown at 135 and a notch 136 is cut diagonally opposite said slit in the end of the sleeve to accommodate a screw-driver by which the sleeve can be turned. The end of the shaft 54 is reduced and the hole in the sleeve 134 through which this reduced end passes is eccentric to the external surface of the sleeve. If it is necessary to change the length of the arm 61 this can bedone by turning this sleeve with a screw-driver, the change in length being brought about by the eccentricity of the sleeve. When the proper adjustment has been reached a tightening of the screw 133 will bind the sleeve 134 against the reduced end of the shaft 54 and will also bind the arm 61 to said sleeve so that the whole thing will work as a rigid arm projecting from the shaft. Adjustment of these parts heretofore been made by bending and peening of the arms which is a far less accurate, permanent and generally satisfactory way of doing it than that described as well as being far more laborious and time-consuming and requiring a much higher degree of skill on the part of the workman.

What I claim as new and. desire to secureby Letters Patent is:

1. In a computing machine, the combination with a rock shaft, a link, and an arm on said rock shaft and pivotally connected with said link, of

means for adjusting said arm both as to its length and as to its position rotatively relative to said shaft andfor securing said armfto said shaft in adjusted relation, said adjusting and securing means comprising a split sleeve on said shaft and having its exterior cylindrical surface eccentric to its bore, a split hub for said arm surrounding s'aid sleeve, and a clamp screw 1 for tightening said hub against said sleeve and thereby tightening said sleeve against said shaft.

" 2. Means forrigidly securing an arm to a shaft with provision for fine adjustment both of the length of the arm and also of its position relative to the shaft, comprising a split sleeve surrounding the shaft and having its periphewy eccentric to its bore, 'a split hub for the aim surrounding said sleeve, and means for tightening said split hub about said sleeve and thereby tightening said sleeve about said shaft, whereby the length of the arm may be adjusted by turning said sleeve and the position of said arm may be adjusted by 

